The NL-42/52 series of hand-held sound level meters can be used for short-term monitoring of road traffic noise. For this purpose, install the function expansion program NX-42EX in the NL-42/52 sound level meter to provide auto store capability. Use the outdoor windscreen WS-15 and mount the meter on a tripod. The level recorder LR-07 can also be used for level recording.

To process recorded data on a computer, use the AS-60 data management software for environmental measurement. With the AS-60, it is possible to check intervals where sound levels are high, and to exclude unnecessary sounds.